Reland "private_code_test: Parse build.ninja to collect linker inputs"

This reverts commit 83e7953b9679c76170adf1b02e13e129e3c6de75.

Reason for revert: Adds non-deterministics files to ignorelist

Original change's description:
> Revert "private_code_test: Parse build.ninja to collect linker inputs"
>
> This reverts commit a6dddc3de16b5c67656254e10ed648354cd3a4f0.
>
> Reason for revert: Suspected of causing failure in deterministic build - https://ci.chromium.org/ui/p/chromium/builders/ci/Deterministic%20Linux/51954 (https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket/8725202020735429233/+/u/compare_build_artifacts/stdout)
>
> Original change's description:
> > private_code_test: Parse build.ninja to collect linker inputs
> >
> > Although slower, this handles the case where GN targets are in public
> > code, but include source files from private code.
> >
> > Bug: 40204298
> > Change-Id: If571518f07855946a16e5aeebe0cace661cc75dd
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5756917
> > Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> > Reviewed-by: Dirk Pranke <dpranke@google.com>
> > Cr-Commit-Position: refs/heads/main@{#1408713}
>
> Bug: 40204298
> Change-Id: I9584a8e46d28ce0f64d263c88d8041cb51368471
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6184083
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1408751}

Bug: 40204298
Change-Id: I330e111f9cf3ca47af8d5c5142d362728a1c429a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6185547
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/main@{#1409216}